I've been shooting a fair few weddings recently and things are starting to pick up nicely. After upgrading to a 5D MKII from a 7D I lost my Tamron 17-50 F2.8 as it doesn't work with the 5D.
Anyway, I've been getting along just fine with the lenses I currently have but would lo to change both of my primary lenses for the newer versions.
70-200 F4 IS ---> 70-200 F2.8 IS II
24-105 F4 IS ---> 24-70 MKII
So if you were me which would you go for first? Like I say, I don't 'need' either of them but both would certainly help out with low light and for creating more aesthetically pleasing images with the depth of field.
Both lenses seem to be around the same price (£1500) in the UK so I'd like to hear your thoughts.